Abstract
Ability of actinobacteria Rhodococcus opacus 1CP to survive under unfavorable conditions and retain its biodegradation activity was assessed. The morphological and ultrastructural features of R. opacus 1CP cells degrading benzoate in the presence of oxidants and stress-protecting agents were investigated. The cells of R. opacus 1CP were resistant to oxidative stress caused by up to 100 mM H2O2 or up to 25 μM juglone (5-oxy-1,4-naphthoquinone). After 2 h of stress impact, changes in the fatty acid composition, increased activity of antioxidant enzymes, and changes in cell morphology and ultrastructure were observed. The strain retained its ability to degrade benzoate. Quercetin had a protective effect on benzoate-degrading cells of R. opacus 1CP. The strategy for cells survival under unfavorable conditions was formulated, which included decreased cell size/volume and formation of densely-packed cell conglomerates, in which the cells are embedded into a common matrix. Formation of conglomerates may probably be considered as a means for protecting the cells against aggressive environmental factors. The multicellular conglomerate structure and the matrix material impede the penetration of toxic substances into the conglomerates, promoting survival of the cells located inside.
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Original Russian Text © I.P. Solyanikova, N.E. Suzina, E.V. Emelyanova, V.N. Polivtseva, A.B. Pshenichnikova, A.G. Lobanok, L.A. Golovleva, 2017, published in Mikrobiologiya, 2017, Vol. 86, No. 2, pp. 188–200.
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Solyanikova, I.P., Suzina, N.E., Emelyanova, E.V. et al. Morphological, physiological, and biochemical characteristics of a benzoate-degrading strain Rhodococcus opacus 1CP under stress conditions. Microbiology 86, 202–212 (2017). https://doi.org/10.1134/S0026261717020199
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DOI: https://doi.org/10.1134/S0026261717020199